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Investments (Summarized Balance Sheet) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Mar. 31, 2018
Pop    
Schedule of Equity Method Investments [Line Items]    
Current assets $ 52.4 $ 48.2
Non-current assets 191.7 191.6
Current liabilities 39.2 37.2
Non-current liabilities [1] 680.8 654.9
Redeemable preferred stock [1] 660.1 638.4
Other    
Schedule of Equity Method Investments [Line Items]    
Current assets 181.1 232.7
Non-current assets 59.3 130.0
Current liabilities 135.1 201.5
Non-current liabilities $ 10.9 $ 45.0
[1] Non-current liabilities includes mandatorily redeemable preferred stock units.